Flat-bed printing machines



May 27, 1958 GERICKE FLAT-BED PRINTING MACHINES Original Filed April 24, 1952 2 Sheets-Sheet 1 l I I l I I I I l l 9D,),

INYENTOR. lirwh GerLolae,

BY 7 WM y 1958 EGERICKE 2,836,417

FLAT-BED PRINTING MACHINES Original Filed April 24, 1952 2 Sheets-Sheet 2 Erich :3,

BY WM, p /M United States Patent FLAT-BED PRINTING MACHINES Erich Gericke, Berlin-Steglitz, Germany Original application April 24, 1952, Serial No. 284,055, now Patent No. 2,897,466, dated September 24, 1957. Divided and this application August 27, 1956, Serial No. 606,378

Claims priority, application Germany April 26, 1951 8 Claims. (Cl. 271-69) This application is a division of my application Serial No. 284,055 filed April 24, 1952, entitled Flat-Bed Printing Machines, now Patent No. 2,807,466.

The invention relates to a pulling-mark head on printing machines, especially ofiset machine, wherein a castor is provided to press a sheet of paper periodically on a pulling rail located beneath it and thereby pulls a sheet of paper against a stop arranged at the pulling-mark head and being adjustable with said head.

It is an object of the invention to provide a pullingmark operating with a caster for right-hand and lefthand application. It is suggested according to the invention to provide the pulling-mark head with one castor and on both sides of the castor with a stop each, or with one stop and one swingable castor on the rightand lefthand side of the stop, or with two castors and a stop arranged between these castors or on both sides of the castor-pair with a stop each and being applicable by means of turning on or turning ofi the stop or by means of swinging of one roll and displacement on the traverse for desired right-hand or left-hand application.

Printing machines provided with adjustable side-marks over the whole width of the applying table have been known so far, on which the sheet of paper can be arranged on both sides and wherein the adjusting head is adjustable for right-hand and left-hand application as well. On these hitherto known printing machines the sheet of paper was not adjusted by pulling but by pushing. It is an object of the present invention to provide a pulling-mark operating with castors for right-hand and left-hand application.

The rail or castor effecting the pulling movement of the pulling-mark head is arranged between the frontmark and the side stops. The pulling rail can be divided transversely and pulls on the right half towards the right and on the left half towards the left-hand side, so that the pulling-mark head has to be adjusted only towards the right-hand side. According to another feature of the invention, a continuous pulling rail can be provided which by shifting of the drive for said rail can be brought to a reverse pulling movement accordingly as to whether the pulling mark head is.to be used for right-hand or left hand application. a

Embodiments of the invention are shown in the drawings in which:

Figure 1 is a front elevation, partly in section, of the pulling head situated on the right-hand side edge, the pulling head comprising one castor and two stops;

Figure 2 is a side elevation of the pulling head;

Figure 3 is a plan of the printing sheet and of the stops which determine the position of the printing sheet;

Figure 4 is an elevation of the pulling rail for the printing sheet;

Figure 5 is an elevation of a pulling head with two castors and one stop;

Figure 6 is an elevation of a pulling head with one easier and one stop;

2,335,41? Patented May 27, 1958 2 Figure 7 is an elevation of a pulling head with two castors and two stops; and

Figure 8 shows a detail of a further embodiment of the invention.

Cooperating with the pulling head 1 is a ledge 2 which carries out the pulling movement and which lies transversely of the direction of running of the paper sheet 3 in the vicinity of the front edge of the sheet and beneath the paper. A castor 4, which is periodically moved up and down, of the pulling head presses the sheet 3 that is to be straightened on to the ledge or rail 2, so that the sheet 3 is pulled by these castors 4 to the side stop 12. The periodic up and down movement of the pulling head 1 is efiected by the cam 6 through a bell-crank lever 7, which acts upon a cross-bar 8. The pulling movement of the ledge 2 is efiected from a cam disc 16 which, with an inclined surface 17, displaces the arm 18 of the ledge 2 horizontally.

According to the invention, the casing 9 of the pulling head 1 is mounted on the cross-bar 3, so that the casing can be displaced over the whole width of the paper and can be clamped in any desired position by means of a clamping screw 10.

In the construction represented in Figure l, the casing 9 carries a caster 4 and two paper-stop marks 11 and 12 which are acted upon by spring pressure and can be locked in their position of rest by clamping screws 13 and 14. Only one of these stop marks will be required at any time, while the unused stop mark, for example the mark 11 in Figure 1, will be pulled up and fixed by the clamping screw 13.

When a sheet (Figure 2) is inserted in the direction of the arrow A, it is first straightened on its front edge at the front mark 15. After this has been effected, the castor 4 is put on the sheet 3 and the side rail or ledge 2 located beneath it carries out the pulling movement to the right indicated by the arrow B, so that the sheet 3 is pulled to the stationary mark 12. When this is done, the sheet 3 remains located in front of the mark 12, while the transverse rail 2 moves on through a small distance. When the transverse rail 2 comes to rest, the castor 4 is raised, owing to the periodic lifting movement of the cross bar 8 by the action of the earn 6 on the bellcrank lever 7, from the sheet 3 which now lies straightened at the front mark 15 and at the right-hand side mark 12.

The front mark 15 then effects a further slight straightening of the front edge of the sheet. The cylinder grippers then seize the sheet and lead it to the printing opera tion while, at the same time, the front mark 15 swings out and frees the path for the sheet 3.

If the sheet is to be straightened on the left-hand edge of the paper, the claimping screw 10 is loosened and the whole pulling-mark head 1 is pushed to the left-hand side of the machine. The right-hand stop 12, which is no longerrequir'ed, is pushed up and is fixed by its clam-ping screw 14, while theclamping screw 13, which holds the stop 11, is loosened, so that the stop 11 occupies, under the action of its spring, the bottom position which is represented by dot-and-dash lines on the left of Fig. l and in which it acts as a stop for the left-hand side of the sheet. Since, now, the pulling movement of the springcontrolled ledge 2 must take place in the opposite direction, the cam disc 16 is, after loosening the square-headed screws 19, rotated about its axis through so that, on the straightening of the sheet on the left-hand side edge, the opposite inclined surface 20 acts against the stop 11.

Fig. 4 shows a construction of the rail 2 which carries out the pulling movement, in which the rail is divided into sections 21 and 22 which are forced apart by a spring 23 and rest, with their castors 24 and 25, on earns 26 a 3 and 2 7 respectively mounted at'opposite ends of the machine. The right-hand half 21 f the rail then pulls to the right and'the left-hand half 22 of the rail then pulls to the left on" the straightening ofthe sheet.

.Fig. shows a pulling-marl; head- 1- which comprises two casters 28. and 29 as well as a's'top 30'located be tween them. In order to straighten'the right-hand edge of ,the'sh eettseen in Fig. l), the'right-hand castor 29 l is raised andfixed, while, in order to straighten the left hand edge of the sheet, the pulling-mark head 1 is pushed" t 4- said pulling head, means for moving said cas'tor periodically for pressing a paper sheet to beregistered against said rail, a stop mounted uponsaid pulling head and means for adjusting said stop in said pulling head to either side of said oastor for registering either side of a sheet;

2. A sheet register asiset forth in claim 1 wherein said stop is .pivotally mounted upon said pulling head,

3. A sheet register for fiat-bed: printing machines comprising a cross bar, a pulling head mountedupon said 33. In order to straighten theright-hand edge of a sheet,

the oastor is brought into the position representedin full lines While, in order to straighten the left-hand edge of a sheet, the shifting of the castor 34 into the position represented in dot-and-dash lines is effected, the pullingmark head 1 being, at the same time, shifted, on the crossbar 8, to the left-hand side of the machine.

'and astation-ary adjustable stop is'provided on said head in the manner as shown in Figs. 1-4. A castor is pro: vided to press a. paper sheet periodically on the rail beheath the head, and the rail is divided transversely into ,two halves, one vof the halvesadapted, to pull the sheet to one side and the other of the halves adapted to pull the sheet to the other sideso that the rail can pull the sheet toward the stationary adjustable' stop on the pulling mark' head. As shown in Fig. 8, the head comprises oaster 39 and stationary stop 49, this last mentionedstav.

tionary stop '40 "adapted to shift to the right-hand side or to the left-hand side of castor 39 as may be required.

Advantageously, the arrangement .of the rail or cas'tor or castors that carries or carry out the pulling movement is between the front mark and the side stops. 7

It is thought that the invention and its advantages will be understood :from the foregoing description and'it is apparent that various changes may be made in the forms,

construction and arrangement of the parts without dc for reciprocating said pullingrail, a caste: mounted in cross bar, a pulling rail located below said head, meansv for reciprocating said pulling rail, a castor mounted in" said pulling head, means for moving said castor, periodicallyfor pressing a paper sheet to be registered against said rail, a stop mounted upon said pulling head and means for changing the relative'lateralpositionsof said stop and 'castor so that said stop-maybe utilized for registering either side of a sheet.

4. A sheetregister for flat-bed printingmachines comprising across bar, a pulling head mounted upon said crossbar, a pulling rail located below said' head,.means for reciprocating said pulling rail, a castor mounted in said pulling head, means for moving said castor periodically for pressing a paper sheet to be registered against said rail, a stop mounted upon said pulling head and means for adjusting said castor in said pulling head'to either side of said stop for registering either side of a sheet.

5. A sheet register as set'forth in claim 3 wherein said, rail is divided into two parts. f

6. A sheet register for flat-bed printing machines com? prisinga cross bar, a pulling head mounted upon said v V crossbar, a pulling railloc'ated below said head, "means" for reciprocating said pulling rail, a stop mounted upon? said pulling head, a first castor mounted in said pulling a 1 head at one side of said stop, a second castormou'nted I V in'said pulling head at the other side, of said stop, me'ansf for'moving one of said castors to inoperative positionj depending upon whi-ch side of a sheet is to' be registered;

and means for moving the other operative castor' periodically for pressing a paper sheet to be registered against 7 said rail.

castor is pivotally mounted; upon said pulling head.

8. On a fiat-bed printing machine, thecombina'tion; comprising a pulling-mark head, a rail beneath said head, 1 a stationary stop on said head and a casto'r on each side of said stop' for press ing a paper.sheetperiodical1y on: i said rail, said rail being'adapted to pull said sheettowards said stationary stop, said rail being dividedi'trans-- versely into two halves, one of said halves being adapted-', to. pull said sheet to one side and the other of said halves 1 'being adapted to pull said sheet to the opposite side and 1 i said stationary stop and castors being adjustable for a,

right-hand or'a left-handapplicationof said sheet. I

V A References Cited in the file of this patent UNITED STATES PATENTS Hollings Aprfl t, 1914 Christophelet a1. Jan. 24, 1922, 

